CN101936873A - Method for obtaining standard instantaneous CO2 flux of soil profile - Google Patents
Method for obtaining standard instantaneous CO2 flux of soil profile Download PDFInfo
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- CN101936873A CN101936873A CN 201010240657 CN201010240657A CN101936873A CN 101936873 A CN101936873 A CN 101936873A CN 201010240657 CN201010240657 CN 201010240657 CN 201010240657 A CN201010240657 A CN 201010240657A CN 101936873 A CN101936873 A CN 101936873A
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Abstract
The invention discloses a standard instantaneous CO2 flux concept of a soil profile and an obtaining method thereof. The method comprises the following steps of: firstly, detecting CO2 concentration in certain soil layer depth by an infrared CO2 analyzer and carrying out hyperbolic equation fit on the change of the CO2 concentration along with detecting time by software to obtain parameters a and b; using acknowledged atmosphere CO2 concentration as reference Ct to be substituted into a hyperbolic equation and calculating corresponding time t<s>; solving a first-order derivative of the hyperbolic equation by Ct to the time t and substituting a t<s> value into a derivative calculation formula to obtain a standard CO2 concentration change rate parameter corresponding to the time; and finally, substituting the standard CO2 concentration change rate parameter into a flux calculation formula to obtain the standard instantaneous CO2 flux of the detected soil layer. The invention can be used for carrying out rapid detection on multiple groups of repeated tests, reduces errors caused by detecting time intervals among a plurality of repeated tests and improves the reliability of data.
Description
Technical field
The present invention relates to agricultural environment information detection technology field, particularly relate to the instantaneous CO of a kind of soil profile standard
2The acquisition methods of flux.
Background technology
Soil profile CO
2The accurate monitoring of flux is the important content of terrestrial ecosystems carbon cycle process study.Obtain the instantaneous CO of the certain soil layer of soil profile
2The common method of flux generally is by CO in the corresponding soil layer of METHOD FOR CONTINUOUS DETERMINATION
2Concentration is in the variation of minute, then according to the forward and backward CO of minute
2The difference of concentration, or by adopting linear fit, CO in the unit's of calculating minute
2The mean change speed of concentration, and then obtain the CO of corresponding soil layer
2Amount of flux.As seen, the flux mean value in the just minute that calculates thus, but not instantaneous flux truly if this mean value is replaced instantaneous flux, will inevitably cause instantaneous CO
2Underestimating of amount of flux.The soil flux mainly is subjected to the influence of environmental factor (soil moisture, water cut etc.) and biodyne (root system of plant, soil microbial activities etc.) etc., reflection be the combined action result of researcher's various factors when measuring.Because environmental baseline (temperature, humidity, CO when different researchers measure
2Concentration etc.) etc. difference, the non-standard attitude measurement result of just different " under the condition " of reflection causes the result who is difficult to different researchers rationally to compare thus, has limited the development in this field.And can then can address this problem for a standard flux of different researcher's references if having.
In view of above present soil CO
2These problems that exist during flux is measured, the present invention proposes the notion and the corresponding acquisition methods thereof of the instantaneous flux of standard, the instantaneous state of determination object when measuring in the hope of making amount of flux both can reflect, provide when the result compares between different researchers again one can reference the universal standard.Adopt this method, also can obtain the instantaneous CO of its corresponding standard at the different soil degree of depth
2Amount of flux.Present related standards CO
2The also rarely seen report of the content of flux aspect.
Summary of the invention
The object of the present invention is to provide a kind of energy conveniently, accurately obtain the instantaneous CO of soil profile different soil standard
2The method of flux.
The instantaneous CO of a kind of soil profile standard
2The acquisition methods of flux is characterized in that carrying out according to following step:
One, at first adopts infrared CO
2Analyser is to the CO at certain soil depth place
2Concentration is measured, and minute is 5min, and data acquiring frequency is 10s; Wherein said soil depth all can according to any soil depth of taking of researcher's needs;
Two, with software to CO
2Concentration is carried out the Hyperbolic Equation match with the variation of minute, obtains parameter a, b; Wherein said Hyperbolic Equation expression formula is:
Wherein, C
tBe instant CO
2Concentration (μ LL
-1), t is minute (s), C
0CO during for t=0
2Concentration (μ LL
-1); A, b are fitting parameter.
Three, the Atmospheric CO to generally acknowledge
2Concentration is 360 (μ LL
-1) be reference standard, with C
tBe 360 (μ LL
-1) bring Hyperbolic Equation into, calculate time corresponding t
sValue.
Four, with the Hyperbolic Equation in the step 2 (1) with C
tT asks first order derivative to the time, can get:
With the t in the equation (2)
sValue is brought following formula (3) into, obtains corresponding standard C O of this moment
2Concentration change rate parameter k
s
Five, with k
sValue is brought flux computing formula (5) into, can obtain to measure the instantaneous CO of standard of soil layer
2Flux, wherein CO
2The flux computing formula is as follows:
In the formula (5), F
sBe standard C O
2Flux (mgm
-2S
-1), ρ
0Be CO under the standard state
2Density (1.96gL
-1), V is the volume (m of sampling air chamber
3), A is sampling air chamber floorage (m
2), k
sBe standard C O
2Concentration change rate parameter (μ LL
-1S
-1).
Therefore, by to CO
2Concentration is carried out hyperbolic fit with the relation that minute changes, and calculates C
tBe 360 (μ LL
-1) time correspondence t
sValue is obtained corresponding standard C O of this moment again
2Concentration change rate parameter k
s, can bring the instantaneous CO of standard that the flux computing formula obtains to measure soil layer into
2Flux.Adopt this method, also can obtain the instantaneous CO of its corresponding standard at the different soil degree of depth
2Amount of flux.
Advantage of the present invention:
1) this method proposes standard C O
2The notion of flux and acquisition methods are for the contrast between different results of study provides normative reference.Instantaneous
2) this method can be calculated instantaneous flux, and the flux that can effectively avoid conventional computing method to bring is underestimated problem.
3) but this method original position is obtained soil profile CO
2Amount of flux need not to use any container to collect, and is on-the-spot with getting with survey, easily and fast.
4) this method is to CO in the mensuration process
2Concentration is abundanter with the fitting data amount that minute changes, and fitting result is more reliable.
5) this method can be carried out fast measuring to many groups revision test, has reduced the error of bringing at interval because of minute between a plurality of repetitions, has increased the reliability of data.
Description of drawings
Fig. 1 each soil layer CO for recording under the different weather condition
2Concentration is with the situation of change of minute, promptly October 9,16 days and 24 days CO
2Concentration is with the variation of minute,
Fig. 2 is different time sections CO on October 12
2Concentration is with the situation of change of minute.
Embodiment
The layout of sampled point: bury the simple and easy impinger of self-control in advance underground at experimental plot soil different depth (5,10,15 and 20cm).The soil air collector is made of the glass funnel of wrapping up in nylon wire outward and inertia plastic conduit (internal diameter 2mm), and plastic conduit one end inserts inverted glass funnel neck, and the connection place seals with paraffin, and the other end is drawn ground.Earlier with the earth boring auger punching, different depth soil layer impinger is buried underground by mutual dislocation when burying underground, and by former soil layer backfill boring.Treat to observe after reclaimed soil and surrounding soil environment reach unanimity.
CO
2The mensuration of concentration: carry out the instantaneous CO of different soil standard in each 9:00~11:00 in the morning that measures day
2The mensuration of flux.During mensuration with plastic conduit by rubber hose and LI-840 CO
2Analyser (Li-COR company produces, the U.S.) probe connects, and smears paraffin with anti-gas-leak at interface.The mensuration that will begin in a minute after connecting, minute is 5min, the data recording frequency is 10s.
With SigmaPlot software to CO
2The match of concentration and minute relation: according to the actual CO that records
2Concentration adopts Hyperbolic Equation that it is carried out match with the Changing Pattern of minute, and its equation is seen formula (1), obtains parametric equation a, b; Then with Atmospheric CO
2Concentration is 360 (μ LL
-1) be reference, by formula (2) calculate C
tBe 360 (μ LL
-1) time correspondence t
sValue, (4) formula of bringing into again calculate corresponding standard C O of this moment
2Concentration change speed k
sAt last with k
sValue is brought the instantaneous CO of standard that the flux computing formula obtains the soil layer of measuring into
2Flux.Adopt this method, can obtain the instantaneous CO of standard of the different soil degree of depth (5,10,15 and 20cm) respectively
2Amount of flux.
Embodiment 1:
In order to prove implementation result of the present invention, (groove width 60cm in the soil box of glasshouse, degree of depth 30cm) arranges the soil air collector in advance, and in the florescence of cucumber growth, choose 3 days (October 9,16 days and 24 days) and in the morning every day 9:00~11:00 carry out soil 5,10,15 and 20cm degree of depth standard C O respectively
2The mensuration of flux.Adopt LI-840 CO
2Analysis-e/or determining CO
2The variation of concentration, minute are 5min, and the data recording frequency is 10s.Measure the back and carry out CO with SigmaPlot software
2The hyperbolic relation match of concentration and minute, basis of calculation CO then
2The instantaneous CO of concentration change speed and standard
2Amount of flux.And the flux during with standard flux of the present invention and t=0, and the amount of flux that conventional method obtains compares, result of calculation sees the following form 1.Table 1, Fig. 1 have shown that all the present invention is to CO in the minute
2The match of concentration change is more reasonable, reliable.
Table 1 fitting result of the present invention and the instantaneous CO of different soils degree of depth standard that calculates
2Amount of flux
As can be seen from Table 1, fitting correlation coefficient of the present invention apparently higher than the linear fitting of routine, therefore confirms that fitting result of the present invention is more credible all greater than 0.99 (n=30).Flux when standard flux result that the present invention is obtained and t=0, and the amount of flux that conventional method obtains compares, visible standard amount of flux is apparently higher than other two kinds of results.For the analysis showed that of flux result between different soil, standard flux representation can effectively reduce contrast difference between soil layer than other two kinds of method for expressing.Flux as 5cm on the 10.9th and 20cm soil layer compares, and the former is on the low side 35% than the latter when representing with the standard flux, and the flux that flux or conventional method obtain during with t=0 represents then to be respectively 37% and 68%.
In addition, the relationship analysis of standard amount of flux and corresponding soils temperature shows in the table 1, and there is significant correlationship in the two, and (r=0.68, n=12), this also is corresponding to existing research conclusion, also further confirms reliability of the present invention simultaneously.
Embodiment 2:
For further proof implementation result of the present invention, in the test of plantation cucumber, carry out the different periods in one day (the instantaneous CO of standard of soil 5cm, 10cm, 15cm and the 20cm degree of depth of 7:00~17:00)
2Flux is measured.Adopt LI-840 CO
2Analysis-e/or determining CO
2The variation of concentration, minute are 5min, and the data recording frequency is 10s.Carry out CO after the mensuration
2The hyperbolic relation match of concentration and minute, basis of calculation CO then
2The instantaneous CO of concentration change speed and standard
2Amount of flux.And the flux during with standard flux of the present invention and t=0, and the amount of flux that conventional method obtains compares, and the results are shown in following table 2.Table 2 and Fig. 2 show that further the present invention is applicable to the mensuration of any period in one day too.
The instantaneous CO of different period soil 10cm degree of depth standards in table 2 the present invention calculate a day
2Amount of flux
Can show further that from the result of table 2 the present invention is applicable to any period in one day, its fitting correlation coefficient is all greater than 0.99 (the n value is 30), apparently higher than the linear fitting of routine.Flux when standard flux of the present invention that the different periods are obtained and t=0, and the amount of flux that conventional method obtains compares, as seen the standard amount of flux is also apparently higher than other two kinds of results, and represents can effectively reduce contrast difference between soil layer than other two kinds of method for expressing with the standard flux.The relationship analysis of standard amount of flux and corresponding soils temperature shows in the table 2, the diurnal variation of amount of flux and the diurnal variation of temperature have consistance to a certain degree, correlationship reaches the level of signifiance, and (r=0.47, n=22), this has also further confirmed the reliability that result of the present invention is suitable for.
Claims (1)
1. instantaneous CO of soil profile standard
2The acquisition methods of flux is characterized in that comprising following process: one, at first adopt infrared CO
2Analyser is to the CO at certain soil depth place
2Concentration is measured, and minute is 5min, and data acquiring frequency is 10s, and wherein said soil depth all can according to any soil depth of taking of researcher's needs;
Two, to CO
2Concentration is carried out the Hyperbolic Equation match with the variation of minute, obtains parameter a, b; Wherein said Hyperbolic Equation expression formula is:
Wherein, C
tBe instant CO
2Concentration (μ LL
-1), t is minute (s), C
0CO during for t=0
2Concentration (μ LL
-1); A, b are fitting parameter.
Three, the Atmospheric CO to generally acknowledge
2Concentration is 360 (μ LL
-1) be reference standard, be 360 (μ LL with Ct
-1) bring Hyperbolic Equation into, calculate time corresponding t
sValue.
Four, with the Hyperbolic Equation in the step 2 (1) with C
tT asks first order derivative to the time, can get:
With the t in the equation (2)
sValue is brought following formula (3) into, obtains corresponding standard C O of this moment
2Concentration change rate parameter k
s
Five, with k
sValue is brought flux computing formula (5) into, can obtain to measure the instantaneous CO of standard of soil layer
2Flux, wherein CO
2The flux computing formula is as follows:
In the formula (5), F
sBe standard C O
2Flux (mgm
-2S
-1), ρ
0Be CO under the standard state
2Density (1.96gL
-1), V is the volume (m of sampling air chamber
3), A is sampling air chamber floorage (m
2), k
sBe standard C O
2Concentration change rate parameter (μ LL
-1S
-1).
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103616496A (en) * | 2013-12-19 | 2014-03-05 | 江苏大学 | Method for measuring soil CO2 flux tidal flat wetland during early and later intertidal periods |
CN106525851A (en) * | 2016-11-04 | 2017-03-22 | 扬州大学 | Physiological model based photosynthesis measurement error correction method under field condition |
CN107462691A (en) * | 2017-07-25 | 2017-12-12 | 兰州大学 | A kind of soil respiration measuring method, apparatus and system |
CN109253949A (en) * | 2018-11-14 | 2019-01-22 | 北京林业大学 | Soil vertical sectional parameter measuring device and CO2Flux computing system |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007047104A (en) * | 2005-08-12 | 2007-02-22 | Japan Atomic Energy Agency | Method and apparatus for measuring 14co2 flux by using flowing-gas technique |
WO2007124585A1 (en) * | 2006-04-27 | 2007-11-08 | St. Francis Xavier University | Apparatus and method for measuring the surface flux of a soil gas component |
CN101131352A (en) * | 2007-06-04 | 2008-02-27 | 高程达 | In-situ measuring method and device for solum carbon dioxide flux |
-
2010
- 2010-07-29 CN CN2010102406577A patent/CN101936873B/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007047104A (en) * | 2005-08-12 | 2007-02-22 | Japan Atomic Energy Agency | Method and apparatus for measuring 14co2 flux by using flowing-gas technique |
WO2007124585A1 (en) * | 2006-04-27 | 2007-11-08 | St. Francis Xavier University | Apparatus and method for measuring the surface flux of a soil gas component |
CN101131352A (en) * | 2007-06-04 | 2008-02-27 | 高程达 | In-situ measuring method and device for solum carbon dioxide flux |
Non-Patent Citations (2)
Title |
---|
《Chinese Science Bulletin》 20071031 REN XiuE et al Estimation of soil respiration in a paddy ecosystem in the subtropical region of China 第52卷, 第19期 2 * |
《中国农学通报》 20070831 朱咏莉等 亚热带稻田能量平衡闭合状况分析 第23卷, 第8期 2 * |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103616496A (en) * | 2013-12-19 | 2014-03-05 | 江苏大学 | Method for measuring soil CO2 flux tidal flat wetland during early and later intertidal periods |
CN103616496B (en) * | 2013-12-19 | 2015-04-22 | 江苏大学 | Method for measuring soil CO2 flux tidal flat wetland during early and later intertidal periods |
CN106525851A (en) * | 2016-11-04 | 2017-03-22 | 扬州大学 | Physiological model based photosynthesis measurement error correction method under field condition |
CN106525851B (en) * | 2016-11-04 | 2019-02-22 | 扬州大学 | Photosynthetic evaluated error bearing calibration based on physiological models under a kind of field condition |
CN107462691A (en) * | 2017-07-25 | 2017-12-12 | 兰州大学 | A kind of soil respiration measuring method, apparatus and system |
CN109253949A (en) * | 2018-11-14 | 2019-01-22 | 北京林业大学 | Soil vertical sectional parameter measuring device and CO2Flux computing system |
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